Composite positive integers written in base 2.

Terms

a(0) =100a(1) =110a(2) =1000a(3) =1001a(4) =1010a(5) =1100a(6) =1110a(7) =1111a(8) =10000a(9) =10010a(10) =10100a(11) =10101a(12) =10110a(13) =11000a(14) =11001a(15) =11010a(16) =11011a(17) =11100a(18) =11110a(19) =100000a(20) =100001a(21) =100010a(22) =100011a(23) =100100a(24) =100110a(25) =100111a(26) =101000a(27) =101010a(28) =101100a(29) =101101